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(CNN) - This week, 35 former Atlanta Public Schools teachers and administrators, including the former superintendent, Beverly Hall, turned themselves into police. They were indicted on charges ranging from racketeering to theft, all tied to a district-wide cheating scandal that was discovered in recent years. It's been described as the largest school cheating scheme in the history of the United States.

The teachers are accused of erasing and changing standardized test answers to improve scores. Those scores are tied closely to state and federal funding as well as teacher bonuses.

The arrests were another step towards closure of a three year saga that's left an indelible mark on Atlanta.

Errol Davis took over as superintendent when Hall resigned in 2011.

CNN Radio interviewed Davis about his journey through the scandal and about changes he's made on testing security at Atlanta's public schools.

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